预嵌锂多壁碳纳米管的性能

doi:10.11901/1005.3093.2018.429

材料研究学报

2019, Vol. 33

Issue (5): 371-378 DOI: 10.11901/1005.3093.2018.429

研究论文

本期目录 | 过刊浏览

预嵌锂多壁碳纳米管的性能

陈玮¹,聂艳艳²,孙晓刚^1,²(

),李旭¹,王杰¹,胡浩¹,梁国东¹,黄雅盼¹,魏成成¹

1. 南昌大学机电工程学院南昌 330031
2. 江西克莱威纳米碳材料有限公司南昌 330052

Performance of Lithium-ion Capacitors Using Pre-lithiated Multi-walled Carbon Nanotube Composite Anode

Wei CHEN¹,Yanyan NIE²,Xiaogang SUN^1,²(

),Xu LI¹,Jie WANG¹,Hao HU¹,Guodong LIANG¹,Yapan HUANG¹,Chengcheng WEI¹

1. Mechanical and Electronic Engineering School, Nanchang University, Nanchang 330031, China
2. Jiangxi Kelaiwei Carbon Nano Co Ltd, Nanchang 330052, China

引用本文:

陈玮,聂艳艳,孙晓刚,李旭,王杰,胡浩,梁国东,黄雅盼,魏成成. 预嵌锂多壁碳纳米管的性能[J]. 材料研究学报, 2019, 33(5): 371-378.
Wei CHEN, Yanyan NIE, Xiaogang SUN, Xu LI, Jie WANG, Hao HU, Guodong LIANG, Yapan HUANG, Chengcheng WEI. Performance of Lithium-ion Capacitors Using Pre-lithiated Multi-walled Carbon Nanotube Composite Anode[J]. Chinese Journal of Materials Research, 2019, 33(5): 371-378.

全文: PDF(6646 KB) HTML

摘要:

使用稳定锂金属粉末(SLMP)/多壁碳纳米管(MWCNTs)作为负极、以活性炭(AC)作为正极组装锂离子电容器，研究其电化学性能。根据恒流充放电(GCD)和交流阻抗谱(EIS)研究了预嵌锂前后锂离子电容器的电化学性能。结果表明，嵌入适量的SLMP可消除碳纳米管大部分固有的不可逆容量并提高电容器的电化学性能。这种电容器具有较高的能量密度、功率密度和优异的循环性能。电流密度为0.05 A/g时预嵌锂碳纳米管锂离子电容器的比电容达到85.18 F/g，电流密度为0.05~4 A/g时最大能量密度和最大功率密度分别为140.4 Wh/kg和5.25 KW/kg，经过3000次循环后容量保持率仍约为82%。

关键词 ：复合材料, 预嵌锂多壁碳纳米管, 内部短路, 稳定锂金属粉末, 锂离子电容器

Abstract：

The electrochemical performance of lithium-ion capacitors with stabilized lithium metal powder/multi-walled carbon nanotubes composite as anode and activated carbon as cathode was investigated by means of galvanostatic charge/discharge (GCD) tests and electrochemical impedance spectroscopy (EIS). The results show that the introduction of stabilized lithium metal powder can eliminate the majority of the inherent irreversible capacity of carbon nanotubes and greatly improve the electrochemical performance of lithium-ion capacitors. The lithium-ion capacitors have a specific capacitance of 85.18 F/g at the current density of 0.05 A/g. The maximum energy density and power density reached 140.4 Wh/kg and 5.25 KW/kg respectively in the current range of 0.05~4 A/g. The continuous galvanostatic charge-discharge cycling tests revealed that the lithium-ion capacitors could maintain 82% of the capacity after 3000 cycles. In sum, the lithium-ion capacitors showed an excellent cycle performance with high energy and power density.

Key words： composites pre-lithiated multi-walled carbon nanotubes internal short stabilized lithium metal powder lithium-ion capacitors

收稿日期: 2018-07-03

ZTFLH:

TM53，O646

基金资助:江西省科技厅(20142BBE50071);江西省教育厅(KJLD13006)

作者简介: 陈玮，男，1994年生，硕士

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	陈玮
	聂艳艳
	孙晓刚
	李旭
	王杰
	胡浩
	梁国东
	黄雅盼
	魏成成
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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2018.429 或 https://www.cjmr.org/CN/Y2019/V33/I5/371

图1 锂离子电容器的内部结构示意图

图2 SLMP的微观形貌

图3 碳纳米管预嵌锂前后的首次充放电曲线和充放电容量电压微分曲线

图4 预嵌锂前后的多壁碳纳米管复合电极的微观形貌

图5 预嵌锂前后碳纳米管负极超级电容器恒流充放电曲线、比容量和电流密度关系曲线与能量密度和功率密度的关系

表1 锂离子电容器在不同电流密度下的功率密度和能量密度以及比电容数据

图6 预嵌锂前后的碳纳米管负极锂离子电容器的循环性能

图7 3000次循环测试前后的电化学交流阻抗谱图

表2 锂离子电容器3000次循环前后的拟合参数

图8 循环前后的多壁碳纳米管复合电极的形貌

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